Composite electric system.



A. D. T. LIBBY.

COMPOSLTE ELEUTBIG SYSTEM. A'PPLIOATIUN FILED 1AE.Z8, 1910.

Patented Apr. 16, 1912.

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QOMPOSITE ELECTRIC SYSTEM.

APPLIQATION 11.21) JAN. 2a, 1910.

1,023,256. Patented Apr. 16, 1912 bye/7757' fl/b/on 0. TL/bbj/ jO-RLLJ UNITED STATES PATENT OFFICE.

ALBION D. T. LIBBY, OF ELYRIA, OHIO, ASSIGNOR TO THE DEAN ELECTRIC COMPANY, OF ELYR-IA, OHIO, A CORPORATION OF OHIO.

Specification of Letters Patent.

Patented Apr. 16, 1912.

Application filed January 25, 1910. Serial N0. 540,574.

T 0 all whom it may concern:

Be it known that I, ALBION I). T. Liner, a citizen of the United States, residing at Ely'ria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Composite Electric Systems; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apnertains to make and use the same.

M invention relates to composite systems consisting of combined police and telephone systems in which I provide telephone connections for talking and signaling in both directions and police signal sending devices at the substations adapted-to send impulses of current to devices at the main station adapted to be operated thereby. I utilize the same conductors for these purposes and aim to reduce the number necessary as much as possible and to prevent interference between the various charactcrs of currents which are used. I show two line conductors connecting the main station and the substations and a third conductor passing through all the substations and terminating in the main conductor. Generally it may be said that I contemplate improvements in the sys terns disclosed in my applications 515,044, August 28, 1909; 540,571, 540,572 and 540,573, January 28, 1910.

Other objects of and improvements made by my invention will appear from the particular description which, when taken in connection with the drawings, will be suflicient to clearly describe the same.

Referring now to the drawings, Figure 1 is a diagram of the circuit arrangement used in one form in which I contemplate embodying my invention. Fig. 2 is a second form. Fig. 3 is a third form.

Referring first to Fig. I. I show a main station at I and two substations at II and III. These stations are connected by line conductors 1 and 2. At each substation I Show a bridge 4 containing the transmitter T, receiver S hook switch I'I--5 and a now inductive resistance I which is for the purpose of preventing an excessive flow of current through the telephone bridge. I show a second bridge 6 at the substation contain ing the lamp I; and the contacts of the relay R. Extending through the substations I Show a third conductor 3 which terminates in the line conductors containing at each substation a high resistance polarized relay R which controls the aforementioned contacts in the lamp bridge 6, a key N, and a police signal sending device E which controls the sending of impulses over the line conductors and the bridge in multiple thereof. At the main station I show a line lamp L and line relay R which latter is operated over the line conductors by current from a source B. Connected in series with the line relay I show a relay R which controls the circuit of the relay R which in turn controls the police signal receiving device Q.

As long as the resistance of the relays R is in the circuit of the battery B, current flow fro said circuit will be insufficient to operate the relay B. This current, howpwr, will operate relay R When the hook switch H5 is closed the current How will be sufficient to operate relay R. At K I show a listening key which is adapted to bridge the attendants set upon the line and at the same time open a switch 7S in the circuit of the line relay interrupting said circuit. At R I show a relay which controls the connection of a source of substation signal controlling and operating current B In the circuit of B I show a relay R which controls contacts in the locking circuit of relay B". This circuit is not operated by the current flowing through the bridges 3 and 6, but is adapted to be operated when the switch H 5 is closed. In this locking cir cuit I show a key 1" by which I may manually interrupt said circuit. The apparatus and its functions will be best. understood from a description of the operation of the system.

The operation is as follows: To (all the attendant at the main station to the telephone, the patrolman removes the receiver from the hook II. closing the following circuit: II-TS429one winding of rclaVII-one windingof relay It""battcr v B-the other winding of R -the other winding of R*101-I5. The relay R is energized, pulling up the armature 11. closing the switch 11-12 and completing the circuit through line lamp L-from ground G-battery B-1112L-73 G. The attendant in responding throws his listening key, interrupting the circuit of the line lamp L at 78 and bridging his set on at 13-14, 15-16. The talking circuit will ing sufiicient to hold up the relays.

- Current will be between the two telephone sets over the line wires as is readily apparent. Should the attendant, at the main station desire to communicate with the pal'roln'ian upon the beat, he throws the key K, completing a circuit through relay lt from ground G battery B -R 171819gl0llntl G The relay is ener ized, attracting its armatures 20, 2t and 22, closing a locking circuit through the following circuit: ground G B R Q1-232425K to ground at G. The attraction of armature 20 inter rupts the line limb 1 at- 20-26 and the line limb 2 at 22-27 and connects the source of current 13? to the line at 2O -28 and 2229.

w from B through R?- 3028201' ridge 3 including; relays R222 29back to B The relays R are energized to close the switches 3031 in the lamp bridges 6. When these switches are closed the current irom the source B- passes through the bridges 6 to the lamps L, the flow of current through the bridge 31b}?- e lamps L are placed in such a position and arranged in such a way that their actuation is ap arent to everyone within a reasonable istance of the lamps. The patrolman observing the light, procccds to the box and takes the receiver from the hook ll, closing the switch H-5. This forms a shunt in the bridges 3 and 6 allowing a. flow of current of greater strength over the line conductors than was permitted by the devices in the bridges 3 and 6. sufficient to energize R which pulls up its armature. 24 interrupting the locking cir' cuit of relay R at-24-25. The relay R is then deencrgized, releasing its armaturesQO, 21 and 22, and restoring the line circuit through to'the listening kcy K. The resistance devices I are placed in-these bridges to revent a flow of current strongcnough' to injure the telephone instruments. They,- however, admit sufiicient current to operate relay R. The operation of the police signal sending devices E or the switch N causes an interruption of the following circuit over \vhielrimpulscs of current are sent: battery B-one winding of R -one winding of R- 1O-13 including R, Nyand E2-9 the other winding of R-the other winding of R"-l ack to battery B. This will operate relay R but will not operate relay R to control its armature. The operation-of re lay R closes a circuit through R which controls the police signal receiving device. In Fig. '2 I show the relay R bridged across the line conductors on the line side of the contacts undercontrol of relay R. The circuit of the line ryhiy is interrupted at the front contacts of the key K. Otherwise the s stem and its operation are identical with tnlt-ot' Fig. 1.

Fig. 3 is similar to Fig. 1, except that I l I This flow of current is,

show in addition a relay R which pulls up and closes a circuit through the police sigha'l receiving device controlling relay B when the circuit through that relay and line is interrupted at the contacts of the relay R I also show a lamp L in shunt of relay R which serves to indicate the current flow in substations.

L is a lamp at R which serves to indicate the connection of the line to the source B th s lamp being extingnishedwhen the circuit of relay R is interrupted.

At the substation I show a branch 6' of the shunt (r which contains the switch 505l normally open but which is'closed for a moment in the upward movement of the switch hook H. The closure of this switch. serves to place a low resistance circuit through 6', the resistance If and 6 across the line and permitting the How 'of sutlicient current to energize R? which attracts its armature 24 interrupting the circuit of R ,!3t1tting off the source I) and completing the line circuit through to the key K. The rethe circuit closed by the switch 50--51 an preventing the How of excess current there- 1n. I have thus produced a system in which I eliminate the third conductor between the first substation and the main station and in which I provide means for signaling the patrolman, said means being operated from the main station over the telephone conductors and automatically disconnected when the patrolman replies. I also provide a line relay and a 011cc signal receiving device controlling re my in series in the line which are non-interfering; and in Fig. 3 I show a device for maintaining the energization of the relay R after the interruption' 'of its normal circuit.

While I have shown' my invention in the particular forms illustrated and described, it will'be obvious to thosetskilled in the art that variations of and dc arturcs from the formsthereof may he ma e without departing from the spirit of m invention, the same bein embodied therein merely for the purpose 0 illustrating the same.

I claim:

1, In a composite system consisting of a combined police and telephone system, the combination of-a niain station substations, conductors connecting said stations, tele in circuit with said instruments, a bridge of combined police and tclcphone syslcln, the 1 combination of'a main station, substations, l conductors connecting said stations. telcthe line. This is for the purpose of ascertaming the condition of the lamps at the sistanccs l are for the purpose ofballasting' -phone inst rumcnts adapted to be connected said conductors passing'through av plurality of said substations, and polictusignal sendmg apparatus connected In said bridge.

9.. In a composite system consisting of a' bone instruments adapted to be connected in circuit with said instruments, a bridge of said conductors passing through a plnralit. of said substations, ing apparatus connected in series in said bridge.

3. In a composite system consisting of a combined police and combination of a main station, a plurality of substations, a pair of line conductors connecting said stations; :1 third conductor connecting the substations and connected atits terminals to the circuit of the said pair of conductors, telephone instruments and police signaliugapparatus adapted to operate over said conductors.

4. In' a composite system consisting of a combined police and telephone system, the -coruhination of a main station, a plurality of substations, a pair of conductors connecting'said stations, a third conductor connecting the substations and connected at its terminals to the circuit of the said pair of conductors, telephone instruments adapted to be connected in bridge of said line conductors, and police signal sending apparatus connected in said third conductor.

In a composite system consisting of a combined telephone and police system, the con'lbination of a main station, a plurality of substations, a pair of line conductors connecting the same, a third conductor connecting said stations and terminating in the circuit of said line conductors, signals at the 5 substations and controling means for said signals connected in'the third conductor.

6. in a composite system consisting of a combined telephone and police system, the combination of a main station, a plurality 40 ofi substations, a pair of line conductors connecting the same, a third conductor connecting said stations and terminating in the circuit of said line conductors, signals at the substations and controlling means for said signals connected in the third conductor, said controlling means under control of the main station attendant.

7. in a composite system consisting of a ('hll'llllllttl police and telephone system, the

combination of a main station. a plurality of substations, a pair of conductors connecting said stations, :1 third conductor connect ing said substations, signals at said substations. and relays controlling said signals connected in the third conductor.

8. in a composite system consisting of a roiubinrd police and telephone system. the cmnbinulion of a main station, a plurality of substations. a pair or' conductors connect an lug said stations, a third conductor connect inc said substations, signals at said substations and a rcla; at each station controlling the signal tlu-rcat connected in the third conductor, said rrlaysundcr control of the as main station attendant.

andpolice signal can telephone system, the

combination of a main station, a

of substations, a pair ofhne conductors con- 90 9. In a composite system consisting-0th combined police and telephone system, the combination of a main station. a plurality of substations, a pair of line conductors conmeeting the samc, a third conductor connecting said substations connected to the circuit of the line conductors, iolice signalsnding apparatus in said thir conductor, signals at said substations, and means in said third y conductor controlling said signals, 7

10. In a composite system consisting f a combined police and telephone systcm the combination of a main station, a plurality of substations, a pair of line conductors connecting'the same, a third conductor connectmg said substations connected .to vthe circuit of the line conductors, police signal sending apparatus in said third conductor, signals at said substations, and rcla s ,in ivr said third conductor cont-rolling saic sig- 35 nalsl v i 11. In a composite system ronsisting ot a combined police and telephone system the plu-ralita nesting the some, a third conductpr connecting and substations connected to the circuit of the line conductors, police si al sendin apparatus in said third cont uctor. sigas. s at. said substations, and ptlarizcd 111- 5 lays in said thirdconduct-or conttolling said signals.

12. In a composite system consisting of a combined telephone and police system, the combination of a main station, a plurality of substations, a pair of line conductors connecting said stations, telephone instruments adapted to be connected in circuit. with said conductors, a third conductor connecting said stations, signals at said substations and polarized relays in said third conductor controlling said signals, said relays under 0011- trol of'thc attendant at the main station.

13. To a com osite system consisting of a combined tclepiionc and police system, the 1 0 combination of a main station, aplurality of substations, conductors connecting said stations, irlophonu instruments adapted to be connected Ill circuit with said conductors,

a third conductor connecting said subst-alions and terminating in the circuit. of sold v conductors, police signal sending apparatus connected in said third conductor, signals at said substations, controlling means for said signals in said third conductor, a source of current, means for connecting said source in circuit with said signals ah'd said line conductors.

14. In a com )osilo system consisting of a combined tolcp mac and pol ice system, the combination of a main station, a. plurality of substations conductors oonncctlng said stations, telephone instruments ada ted to be connected in rimuit with said com actors, a third conductor connecting said substa 130 tions and terminating in the eii-ouit of said conductors, police signal sending'apparatus connected in said third conductor, signals at said substations, controlling means for said signals in said third conductor, a source of current, means for connecting said source in oircultwith said signals and-said line conductors, and means preventing a heavy flow of current from said souroe through said telephone instruments.

15." In a composite system consisting of a combined police and telephone s; stem, the

combination of a main station, a plurality substations, and means in said bridge 'pre venting the operation of said signal police signal impulses.

- 16. In a composite system consisting 'of a combined police and telephone system, the combination of a main station, a-plurality of substations, a pair ofline conductors con-' necting said stations, telephone instruments y said through sai "adapted e3 gbe. bridged across said conductors, a bridge of said conductors passing substations, a signal at the main station controlled from said substation, police signal impulse sending means at said substations, and relays in said bridge whose resistance prevents the operation of said si' al by said police signal impulses.

17. n a composite systemconsisting of a combined police and telephone system, the combination of a main station, a. plurality of substations, a pair of lineoonductors con- .necting the same, abrid e of said conductors passing through sai substations,' a signal at the main station controlled from the substation, police signal sending and IEQfBiVn. ing means operating over said system, and

means insaid bridlgepr'eventing the operation of said si the current of t e receiving. means.

In testimony whereof I affix my signature in presence of two witnesses.

A. D. 'r. LIBBY.

police'signal' sending and Witnesses:

F. 0. Breast, Jos. J. Mrznn.

a at the main station by 

